Illumination system, projection apparatus, and projection method of projection apparatus

ABSTRACT

An illumination system, a projection apparatus, and a projection method of the projection apparatus are provided. The illumination system includes an excitation light source, a light combination element, a reflection element, a light wavelength conversion module, and an actuator. The reflection element is disposed on a transmission path of the excitation beam transmitted from the light combination element. The light wavelength conversion module is disposed on a transmission path of the excitation beam transmitted from the reflection element. The light wavelength conversion module has at least one reflection area and at least one light conversion area. The actuator is coupled to the reflection element to change a rotation angle of the reflection element, such that the excitation beam transmitted from the reflection element is transmitted to the at least one reflection area and the at least one light conversion area via different transmission paths.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serialno. 201810606157.7, filed on Jun. 13, 2018. The entirety of theabove-mentioned patent application is hereby incorporated by referenceherein and made a part of this specification.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The invention relates to an optical system, a display device using theoptical system, and a projection method of the display device, and inparticular, to an illumination system, a projection apparatus, and aprojection method of the projection apparatus.

2. Description of Related Art

In general, a projection apparatus includes an illumination system, alight valve, and a projection lens. The illumination system usuallygenerates required color light using an excitation light source inconjunction with a phosphor wheel, and improves the color purity of thecolor light by means of a filter wheel. In the illumination system ofthe prior art, the phosphor wheel and the filter wheel must be rotatedsynchronously in order to successfully output various beams of colorlight in corresponding time periods. However, because the light valvecapable of supporting the synchronous rotation of the phosphor wheel andthe filter wheel is very expensive, it is impossible to effectivelyreduce the cost of the projection apparatus using this kind ofillumination system.

The information disclosed in this “BACKGROUND OF THE INVENTION” sectionis only for enhancement of understanding of the background of thedescribed technology and therefore it may contain information that doesnot form the prior art that is already known to a person of ordinaryskill in the art. The information disclosed in this “BACKGROUND OF THEINVENTION” section does not represent the problems to be resolved by oneor more embodiments of the invention, and it also does not mean that theinformation is acknowledged by a person of ordinary skill in the artbefore the application of the invention.

SUMMARY OF THE INVENTION

The invention provides an illumination system, which is conducive toreduction of manufacturing cost of an illumination system.

The invention provides a projection apparatus using the aforementionedillumination system, such that the projection apparatus has an effect oflow cost.

The invention also provides a projection method of the aforementionedprojection apparatus, which is conducive to reduction of time cost forsignal processing of the projection apparatus.

Other objects and advantages of the invention can be further illustratedby the technical features broadly embodied and described as follows.

In order to achieve one, a portion of, or all of the aforementionedobjectives or other objectives, an embodiment of the invention providesan illumination system, which includes an excitation light source, alight combination element, a reflection element, a light wavelengthconversion module, and an actuator. The excitation light source isadapted to provide an excitation beam. The light combination element isdisposed on a transmission path of the excitation beam emitted from theexcitation light source. The reflection element is disposed on atransmission path of the excitation beam transmitted from the lightcombination element. The light wavelength conversion module is disposedon a transmission path of the excitation beam transmitted from thereflection element. The light wavelength conversion module has at leastone reflection area and at least one light conversion area. The at leastone reflection area reflects the excitation beam. The at least one lightconversion area converts the excitation beam into a conversion beam andreflects the conversion beam. The excitation beam reflected by the atleast one reflection area and the conversion beam reflected by the atleast one light conversion area are reflected by the reflection elementand thus transmitted back to the light combination element. The actuatoris coupled to the reflection element to change a rotation angle of thereflection element, such that the excitation beam transmitted from thereflection element is transmitted to the at least one reflection areaand the at least one light conversion area via different transmissionpaths.

In order to achieve one, a portion of, or all of the aforementionedobjectives or other objectives, an embodiment of the invention providesa projection apparatus, which includes the aforementioned illuminationsystem, a light valve and a projection lens. The light valve is disposedon a transmission path of an illumination beam output from theillumination system and converts the illumination beam into an imagebeam. The projection lens is disposed on a transmission path of theimage beam.

In order to achieve one, a portion of, or all of the aforementionedobjectives or other objectives, an embodiment of the invention providesa projection method of the aforementioned projection apparatus, whichincludes steps as follow: turning on the excitation light source toprovide the excitation beam; and changing a rotation angle of thereflection element by the actuator, such that the excitation beamtransmitted from the reflection element is transmitted to the at leastone reflection area and the at least one light conversion area of thelight wavelength conversion module via different transmission paths.

Based on the foregoing, the embodiments of the invention have at leastone of the following advantages or effects. In the embodiments of theillumination system and the projection method of the projectionapparatus of the invention, the actuator controls the rotation angle ofthe reflection element, such that the excitation beam transmitted fromthe reflection element is transmitted to different optical areas on thelight wavelength conversion module in different time periods. Therefore,the rotation of the filter module and the rotation of the lightwavelength conversion module may be not synchronous. That is to say, theprojection apparatus using the illumination system and the projectionmethod of the projection apparatus of the invention may adopt a lightvalve only supporting synchronous rotation with the filter module,thereby reducing the cost. Accordingly, the illumination system and theprojection method of the projection apparatus of the invention areconducive to reduction of the cost of the projection apparatus.Moreover, the cost of the projection apparatus of the invention is low.

Other objectives, features and advantages of the invention will befurther understood from the further technological features disclosed bythe embodiments of the invention wherein there are shown and describedpreferred embodiments of this invention, simply by way of illustrationof modes best suited to carry out the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate exemplaryembodiments of the invention and, together with the description, serveto explain the principles of the invention.

FIG. 1A to FIG. 1C are schematic diagrams of a projection apparatuswithin a first time period to a third time period in a first embodimentof the invention respectively.

FIG. 2A is a schematic diagram of a relationship between the wavelengthand reflectance of a dichroic portion of a light combination element inthe first embodiment of the invention.

FIG. 2B is a schematic diagram of a relationship between the wavelengthand transmittance of a penetration portion of a light combinationelement in the first embodiment of the invention.

FIG. 2C is a schematic diagram of a relationship between the wavelengthand reflectance of a partially transmissive partially reflective elementin the first embodiment of the invention.

FIG. 3 is a front view of an implementation type of a light wavelengthconversion module in the first embodiment of the invention.

FIG. 4 is a front view of an implementation type of a filter module inthe first embodiment of the invention.

FIG. 5 is a flowchart of a projection method of the projection apparatusin the first embodiment of the invention.

FIG. 6A to FIG. 6C are front views of other implementation types of alight wavelength conversion module in the first embodiment of theinvention respectively.

FIG. 7A to FIG. 7C are schematic diagrams of a projection apparatuswithin a first time period to a third time period in a second embodimentof the invention respectively.

FIG. 8 is a flowchart of a projection method of the projection apparatusin the second embodiment of the invention.

FIG. 9A to FIG. 9C are schematic diagrams of a projection apparatuswithin a first time period to a third time period in a third embodimentof the invention respectively.

FIG. 10 is a flowchart of a projection method of the projectionapparatus in the third embodiment of the invention.

DESCRIPTION OF THE EMBODIMENTS

In the following detailed description of the preferred embodiments,reference is made to the accompanying drawings which form a part hereof,and in which are shown by way of illustration specific embodiments inwhich the invention may be practiced. In this regard, directionalterminology, such as “top,” “bottom,” “front,” “back,” etc., is usedwith reference to the orientation of the Figure(s) being described. Thecomponents of the invention can be positioned in a number of differentorientations. As such, the directional terminology is used for purposesof illustration and is in no way limiting. On the other hand, thedrawings are only schematic and the sizes of components may beexaggerated for clarity. It is to be understood that other embodimentsmay be utilized and structural changes may be made without departingfrom the scope of the invention. Also, it is to be understood that thephraseology and terminology used herein are for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” or “having” and variations thereof herein ismeant to encompass the items listed thereafter and equivalents thereofas well as additional items. Unless limited otherwise, the terms“connected,” “coupled,” and “mounted” and variations thereof herein areused broadly and encompass direct and indirect connections, couplings,and mountings. Similarly, the terms “facing,” “faces” and variationsthereof herein are used broadly and encompass direct and indirectfacing, and “adjacent to” and variations thereof herein are used broadlyand encompass directly and indirectly “adjacent to”. Therefore, thedescription of “A” component facing “B” component herein may contain thesituations that “A” component directly faces “B” component or one ormore additional components are between “A” component and “B” component.Also, the description of “A” component “adjacent to” “B” componentherein may contain the situations that “A” component is directly“adjacent to” “B” component or one or more additional components arebetween “A” component and “B” component. Accordingly, the drawings anddescriptions will be regarded as illustrative in nature and not asrestrictive.

FIG. 1A to FIG. 1C are schematic diagrams of a projection apparatuswithin a first time period to a third time period in a first embodimentof the invention respectively. FIG. 2A is a schematic diagram of arelationship between the wavelength and reflectance of a dichroicportion of a light combination element in the first embodiment of theinvention. FIG. 2B is a schematic diagram of a relationship between thewavelength and transmittance of a penetration portion of a lightcombination element in the first embodiment of the invention. FIG. 2C isa schematic diagram of a relationship between the wavelength andreflectance of a partially transmissive partially reflective element inthe first embodiment of the invention. FIG. 3 is a front view of animplementation type of a light wavelength conversion module in the firstembodiment of the invention. FIG. 4 is a front view of an implementationtype of a filter module in the first embodiment of the invention. FIG. 5is a flowchart of the projection method of a projection apparatus in thefirst embodiment of the invention.

Referring to FIG. 1A to FIG. 1C, a projection apparatus 10 includes anillumination system 100, a light valve 200 and a projection lens 300.The illumination system 100 outputs an illumination beam IB, wherein theillumination beam IB includes an excitation beam B output from theillumination system 100 in FIG. 1A, a first color beam B1 output fromthe illumination system 100 in FIG. 1B and a conversion beam CB2 outputfrom the illumination system 100 in FIG. 1C. The light valve 200 isdisposed on a transmission path of the illumination beam IB and convertsthe illumination beam IB into an image beam MB. For example, the lightvalve 200 is, but not limited to, a digital micro-mirror device (DMD), aliquid-crystal-on-silicon (LCOS) panel or a transmissive liquid crystalpanel. The projection lens 300 is disposed on a transmission path of theimage beam MB to project the image beam MB to a screen, a wall or otherimageable objects.

The illumination system 100 includes an excitation light source 110, alight combination element 120, a reflection element 130, a lightwavelength conversion module 140, and an actuator 150. The excitationlight source 110 is adapted to provide an excitation beam B. Forexample, the excitation light source 110 includes a single lightemitting element or the excitation light source 110 includes a pluralityof light emitting elements. The light emitting element may include alaser diode, a light emitting diode or a combination of theaforementioned two light emitting elements. In addition, the pluralityof light emitting elements may be arranged in an array. The lightcombination element 120 is disposed on a transmission path of theexcitation beam B emitted from the excitation light source 110. In theembodiment, the light combination element 120 includes a dichroicportion 122 and a penetration portion 124.

As shown in FIG. 1A, the dichroic portion 122 is disposed on thetransmission path of the excitation beam B emitted from the excitationlight source 110, and the dichroic portion 122 is adapted to reflect theexcitation beam B. The dichroic portion 122 is, for example, a dichroiclayer disposed on the light combination element 120. In addition, thepenetration portion 124 is disposed on a transmission path of theexcitation beam B sequentially reflected by a reflection area R of thelight wavelength conversion module 140 and the reflection element 130,and the penetration portion 124 allows the excitation beam B to passthrough. The penetration portion 124 is, for example, a substrate madeof transparent material, the transparent material is glass, for example.

As shown in FIG. 1B (or FIG. 1C), the dichroic portion 122 is alsodisposed on a transmission path of a conversion beam CB1 (or conversionbeam CB2) sequentially reflected by a light conversion area C1 (or lightconversion area C2) of the light wavelength conversion module 140 andthe reflection element 130, and the dichroic portion 122 allows theconversion beam CB1 (or conversion beam CB2) to pass through. Inaddition, the penetration portion 124 is also disposed on thetransmission path of the conversion beam CB1 (or conversion beam CB2)sequentially reflected by the light conversion area C1 (or lightconversion area C2) of the light wavelength conversion module 140 andthe reflection element 130, and the penetration portion 124 allows theconversion beam CB1 (or conversion beam CB2) to pass through.

The reflectance of the dichroic portion 122 and the transmittance of thepenetration portion 124 are designed according to wavelength bands ofthe excitation beam B, the conversion beam CB1 and the conversion beamCB2. In the embodiment, the excitation beam B, the conversion beam CB1and the conversion beam CB2 are a blue beam, a yellow beam and a greenbeam, respectively. Therefore, the dichroic portion 122 is adapted toreflect the excitation beam B and allow the conversion beam CB1 and theconversion beam CB2 to pass through, the reflectance of the dichroicportion 122 is equal to or approximate to 100% at a blue light band, andthe reflectance of the dichroic portion 122 is equal to or approximateto 0% at a yellow light band, a green light band and otherlong-wavelength bands, as shown in FIG. 2A. In addition, thetransmittance of the penetration portion 124 (which allows theexcitation beam B, the conversion beam CB1 and the conversion beam CB2to pass through) is equal to or approximate to 100% at the blue lightband, the yellow light band, the green light band and otherlong-wavelength bands, as shown in FIG. 2B.

The reflection element 130 is disposed on a transmission path of theexcitation beam B transmitted from the light combination element 120. Inthe embodiment, the reflection element 130 is disposed on a transmissionpath of the excitation beam B passing through the dichroic portion 122of the light combination element 120. The reflection element is adaptedto reflect the excitation beam B, the conversion beam CB1 and theconversion beam CB2. For example, the reflection element may be areflection mirror, a substrate having a reflection coating layer or anyother elements for reflecting light beams.

The light wavelength conversion module 140 is disposed on a transmissionpath of the excitation beam B transmitted from the reflection element130. The light wavelength conversion module 140 has at least onereflection area R and at least one light conversion area C. In theembodiment, the light wavelength conversion module 140 has a reflectionarea (the reflection area R as shown in FIG. 3) and two light conversionareas C (the light conversion area C1 and the light conversion area C2as shown in FIG. 3). In addition, the reflection area R, the lightconversion area C1 and the light conversion area C2 are distributed in astrip form. As shown in FIG. 3, the light conversion area C1 and thelight conversion area C2 may be disposed on two opposite sides of thereflection area R, respectively. However, the respective number of thereflection area R and the light conversion areas C in the lightwavelength conversion module 140 and the arrangement of the reflectionarea R and the light conversion areas C are not limited to those shownin FIG. 3.

The reflection area R is adapted to reflect the excitation beam B, andthe light conversion area C (such as the light conversion area C1 andthe light conversion area C2) is adapted to convert the excitation beamB into the conversion beam (such as the conversion beam CB1 and theconversion beam CB2) and reflect the conversion beam. The excitationbeam B reflected by the reflection area R and the conversion beamreflected by the light conversion area C are reflected by the reflectionelement 130 and thus transmitted back to the light combination element120.

For example, a reflection layer or a reflection element may be providedin the reflection area R. In addition, a light wavelength conversionmaterial and a reflection layer (or a reflection element) may beprovided in the light conversion area C. The light wavelength conversionmaterial may be phosphor powder, quantum dots or a combination of thetwo materials. Light scattering particles may also be selectivelyprovided in the light conversion area C to improve the conversionefficiency. In the embodiment, the light wavelength conversion module140 includes a reflection layer 142, a light wavelength conversionmaterial 144 and a light wavelength conversion material 146. Thereflection layer 142 is provided in the light conversion area C1, thereflection area R and the light conversion area C2. The light wavelengthconversion material 144 is provided in the light conversion area C1, andthe light wavelength conversion material 144 is adapted to convert theexcitation beam B into the conversion beam CB1. The light wavelengthconversion material 146 is provided in the light conversion area C2, andthe light wavelength conversion material 146 is adapted to convert theexcitation beam B into the conversion beam CB2.

The light wavelength conversion module 140 may also selectively includea heat sink 148 for heat dissipation. Specifically, the reflection areaR and the light conversion area C are disposed on the heat sink 148. Asshown in FIG. 1A to FIG. 1C, the reflection layer 142 may be disposed ona surface S, facing the reflection element 130, of the heat sink 148,and the reflection layer 142 may be located between the light wavelengthconversion material 144 and the heat sink 148 and located between thelight wavelength conversion material 146 and the heat sink 148. However,the number of elements in the light wavelength conversion module 140 anda relative configuration relationship therebetween may be changed asrequired.

The actuator 150 is coupled to the reflection element 130, and theactuator 150 is adapted to drive the reflection element 130 to swing, soas to change at least one of a rotation angle and rotation direction ofthe reflection element 130, thereby transferring the excitation beam Btransmitted from the reflection element 130 to the reflection area R,the light conversion area C1 and the light conversion area C2 viadifferent transmission paths.

Specifically, the rotation angle and rotation direction of thereflection element 130 may be determined according to dimensions,relative distances and relative configuration relationships of thereflection area R, the light conversion area C1 and the light conversionarea C2, and other parameters. In the embodiment, the reflection area Ris disposed between the light conversion area C1 and the lightconversion area C2, wherein the light conversion area C1 is closer to abottom surface SB of the heat sink 148 than the light conversion areaC2. Under this framework, when a projection area of the excitation beamB is to be changed from the reflection area R to the light conversionarea C1, as shown in FIG. 1B, the reflection element 130 may be rotatedcounterclockwise by a second rotation angle θ2 from an inclination planeP1 where the reflection element 130 is located in FIG. 1A to aninclination plane P2, such that the speckle of the excitation beam Boriginally projected to the reflection area R move into the lightconversion area C1 toward the bottom surface SB of the heat sink 148.When the projection area of the excitation beam B is to be changed fromthe light conversion area C1 to the light conversion area C2, as shownin FIG. 1C, the reflection element 130 may be rotated clockwise by athird rotation angle θ3 from the inclination plane P2 where thereflection element 130 is located in FIG. 1B to an inclination plane P3,such that the speckle of the excitation beam B originally projected tothe light conversion area C1 move into the light conversion area C2toward a top surface ST of the heat sink 148. When a projection area ofthe excitation beam B is to be changed from the light conversion area C2to the reflection area R, as shown in FIG. 1A, the reflection element130 may be rotated counterclockwise by a first rotation angle θ1 fromthe inclination plane P3 where the reflection element 130 is located inFIG. 1C to the inclination plane P1, such that the speckle of theexcitation beam B originally projected to the light conversion area C2move into the reflection area R toward the bottom surface SB of the heatsink 148. More specifically, the reflection element 130, depending onthe actuator 150, swings so as to generate the first rotation angle θ1,the second rotation angle θ2 and the third rotation angle θ3 accordingto a center axis of the reflection element 130 (not shown).

The illumination system 100 may selectively include other elementsaccording to different demands. For example, the illumination system 100may further include a partially transmissive partially reflectiveelement 160. As shown in FIG. 1A, the partially transmissive partiallyreflective element 160 is disposed on the transmission path of theexcitation beam B passing through the penetration portion 124, whereinthe partially transmissive partially reflective element 160 allows afirst part P1 of the excitation beam B passed through the penetrationportion 124 to pass through, and the partially transmissive partiallyreflective element 160 reflects a second part P2 of the excitation beamB passed through the penetration portion 124. The dichroic portion 122is also disposed on the transmission path of the second part P2reflected by the partially transmissive partially reflective element160, and the dichroic portion 122 reflects the second part P2. As shownin FIG. 1B (or FIG. 1C), the partially transmissive partially reflectiveelement 160 is also disposed on the transmission path of the conversionbeam CB1 (or conversion beam CB2) passing through the penetrationportion 124, and the partially transmissive partially reflective element160 allows the conversion beam CB1 (or conversion beam CB2) to passthrough. For example, the reflectance of the partially transmissivepartially reflective element 160 is equal to or approximate to 50% atthe blue light band, and the reflectance of the partially transmissivepartially reflective element 160 is equal to or approximate to 0% at theyellow light band, the green light band and other long-wavelength bands,as shown in FIG. 2C. However, the reflectance of the partiallytransmissive partially reflective element 160 at the blue light band maybe adjusted according to actual demands, and is not limited to 50%. Thepartially transmissive partially reflective element 160 is, for example,a transparent substrate having a coating layer which allows 50% bluelight to pass through and reflects 50% blue light, and may allow theyellow light band, the green light band and other long-wavelength bandsto pass through.

The illumination system 100 may further include a filter module 170, soas to improve the color purity of the illumination beam IB. The filtermodule 170 is, for example, a filter wheel. The filter module 170 isdisposed on transmission paths of the excitation beam B, the conversionbeam CB1 and the conversion beam CB2 transmitted from the lightcombination element 120.

The excitation beam B reflected by the reflection area R and theconversion beam (such as the conversion beam CB1 and the conversion beamCB2) reflected by the light conversion area C (such as the lightconversion area C1 and the light conversion area C2) are transmittedtoward the filter module 170 sequentially via the reflection element 130and the light combination element 120.

The filter module 170 has a plurality of filter areas F such as a filterarea F1, a filter area F2 and a filter area F3 as shown in FIG. 4. Thefilter area F1, the filter area F2 and the filter area F3 cut into thetransmission paths of the excitation beam B, the conversion beam CB1 andthe conversion beam CB2 transmitted from the light combination element120 in turns. In the embodiment, the filter area F1 is a blue filterarea. The filter area F1 may be provided with a filter which allows atleast a portion of the excitation beam B (such as a blue beam) to passthrough and filters out/absorbs the remaining color beams. In addition,the filter area F1 may have the characteristics of a diffuser toeffectively improve the problem of laser speckles generated by laser.The filter area F2 is a red filter area. The filter area F2 may beprovided with a filter which allows at least a portion of the firstcolor beam B1 (such as a red beam) to pass through and filtersout/absorbs the remaining color beams. The filter area F3 is a greenfilter area. The filter area F3 may be provided with a filter whichallows at least a portion of the conversion beam CB2 (such as a greenbeam) to pass through and filters out/absorbs the remaining color beams.However, the number of filter areas F included in the filter module 170,the arrangement sequence and the color of each filter area F may bechanged as required, and are not limited to the above.

The illumination system 100 may further include a plurality of lenselements, so as to achieve the effect of converging beams or collimatingbeams. In the embodiment, the illumination system 100 includes a lenselement 181, a lens element 182, a lens element 183, and a lens element184. However, the number of lens elements and a relative arrangementrelationship may be changed according to actual demands, and are notlimited to those shown in FIG. 1A to FIG. 1C.

The illumination system 100 may further include a light uniformizingelement 190. The light uniformizing element 190 is disposed ontransmission paths of the excitation beam B, the first color beam B1 andthe conversion beam CB2 output from the filter module 170, so as toimprove the uniformity of the illumination beam IB. For example, thelight uniformizing element 190 is, but not limited to, a lightIntegration rod or a lens array.

Referring to FIG. 1A to FIG. 5, a projection method of the projectionapparatus 10 includes steps as follow. First, turning on the excitationlight source 110 to provide the excitation beam B (Step 510); and then,changing at least one of the rotation angle and rotation direction ofthe reflection element 130, such that the excitation beam B transmittedfrom the reflection element 130 is transmitted to the reflection area Rand the light conversion area C of the light wavelength conversionmodule 140 via different transmission paths (Step 520).

In particular, referring to FIG. 1A, the filter area F1 of the filtermodule 170 cuts into the transmission path of the light beam transmittedfrom the lens element 184 within a first time period. The reflectionelement 130 is rotated to the first rotation angle θ1 via the actuator150, such that the excitation beam B emitted from the excitation lightsource 110 is transmitted to the reflection area R of the lightwavelength conversion module 140 sequentially via the lens element 181,the dichroic portion 122 of the light combination element 120, thereflection element 130 having the first rotation angle θ1, the lenselement 182 and the lens element 183. The excitation beam B is thenreflected by the reflection area R, sequentially pass through the lenselement 183 and the lens element 182, and transmitted back to thereflection element 130 having the first rotation angle θ1, and theexcitation beam B is reflected by the reflection element 130 having thefirst rotation angle θ1 again and thus transmitted to the lightcombination element 120. The excitation beam B transmitted to the lightcombination element 120 passes through the penetration portion 124 ofthe light combination element 120. The first part P1 of the excitationbeam B passed through the penetration portion 124 of the lightcombination element 120 is transmitted to the filter module 170 throughthe lens element 184. The second part P2 of the excitation beam B passedthrough the penetration portion 124 of the light combination element 120is sequentially reflected by the partially transmissive partiallyreflective element 160 and the dichroic portion 122 of the lightcombination element 120, and then transmitted to the filter module 170through the lens element 184. The filter area F1 of the filter module170 allows at least a portion of the excitation beam B to pass through.In other words, the illumination system 100 outputs the excitation beamB within the first time period.

Referring to FIG. 1B, the filter area F2 of the filter module 170 cutsinto the transmission path of the light beam transmitted from the lenselement 184 within a second time period. The reflection element 130 isrotated to the second rotation angle θ2 via the actuator 150, such thatthe excitation beam B emitted from the excitation light source 110 istransmitted to the light conversion area C1 of the light wavelengthconversion module 140 sequentially via the lens element 181, thedichroic portion 122 of the light combination element 120, thereflection element 130 having the second rotation angle θ2, the lenselement 182 and the lens element 183. The light conversion area C1converts the excitation beam B into the conversion beam CB1 and reflectsthe conversion beam CB1. The conversion beam CB1 reflected by the lightconversion area C1 is transmitted back to the reflection element 130having the second rotation angle θ2 after sequentially passing throughthe lens element 183 and the lens element 182, and the conversion beamCB1 is reflected by the reflection element 130 having the secondrotation angle θ2 and thus transmitted to the light combination element120. A first part CBP1 of the conversion beam CB1 transmitted to thedichroic portion 122 of the light combination element 120 is transmittedto the filter module 170 through the lens element 184. A second partCBP2 of the conversion beam CB1 transmitted to the penetration portion124 of the light combination element 120 is transmitted to the filtermodule 170 after sequentially passing through the partially transmissivepartially reflective element 160 and the lens element 184. The filterarea F2 of the filter module 170 allows a first color beam B1 (such as ared beam) in the conversion beam CB1 (such as a yellow beam) to passthrough, and filters out/absorbs a green beam in the conversion beamCB1. In other words, the illumination system 100 outputs the first colorbeam B1 within the second time period.

Referring to FIG. 1C, the filter area F3 of the filter module 170 cutsinto the transmission path of the light beam transmitted from the lenselement 184 within a third time period. The reflection element 130 isrotated to the third rotation angle θ3 via the actuator 150, such thatthe excitation beam B emitted from the excitation light source 110 istransmitted to the light conversion area C2 of the light wavelengthconversion module 140 sequentially via the lens element 181, thedichroic portion 122 of the light combination element 120, thereflection element 130 having the third rotation angle θ3, the lenselement 182 and the lens element 183. The light conversion area C2converts the excitation beam B into the conversion beam CB2 and reflectsthe conversion beam CB2. The conversion beam CB2 reflected by the lightconversion area C2 is transmitted back to the reflection element 130having the third rotation angle θ3 after sequentially passing throughthe lens element 183 and the lens element 182, and the conversion beamCB2 is reflected by the reflection element 130 having the third rotationangle θ3 and thus transmitted to the light combination element 120. Afirst part CBP3 of the conversion beam CB2 transmitted to the dichroicportion 122 of the light combination element 120 is transmitted to thefilter module 170 through the lens element 184. A second part CBP4 ofthe conversion beam CB2 transmitted to the penetration portion 124 ofthe light combination element 120 is transmitted to the filter module170 after sequentially passing through the partially transmissivepartially reflective element 160 and the lens element 184. The filterarea F3 of the filter module 170 allows at least a portion of theconversion beam CB2 to pass through. In other words, the illuminationsystem 100 outputs the conversion beam CB2 within the third time period.

It should be noted that the sizes of the first rotation angle θ1, thesecond rotation angle θ2 and the third rotation angle θ3 may be changedaccording to dimensions, relative distances and relative configurationrelationships of the reflection area R, the light conversion area C1 andthe light conversion area C2, and other parameters, and are not limitedto those shown in FIG. 1A to FIG. 1C.

The actuator 150 controls at least one of the rotation angle androtation direction of the reflection element 130, such that theexcitation beam B transmitted from the reflection element 130 istransmitted to different optical areas (such as the reflection area R,the light conversion area C1 and the light conversion area C2) on thelight wavelength conversion module 140 in different time periods, andthus the illumination system 100 output different color beams (such asthe blue beam, the red beam and the green beam) in different timeperiods. Therefore, the light wavelength conversion module 140 may notrotate. That is to say, the positions of the reflection area R, thelight conversion area C1 and the light conversion area C2 may be fixedduring the provision of the excitation beam B emitted from theexcitation light source 110. Therefore, the projection apparatus 10 mayadopt the light valve 200 only supporting synchronous rotation with thefilter module 170, thereby reducing the cost. Accordingly, theillumination system 100 and the projection method of the projectionapparatus 10 are conducive to reduction of the cost of the projectionapparatus 10, such that the projection apparatus 10 may have theadvantage of low cost.

FIG. 6A to FIG. 6C are front views of other implementation types of alight wavelength conversion module in the first embodiment of theinvention respectively. The light wavelength conversion module in FIG.6A to FIG. 6C is similar to the light wavelength conversion module inFIG. 3. These light wavelength conversion modules are mainly differentin the arrangement manner of the at least one reflection area R and theat least one light conversion area C. Specifically, in FIG. 6A and FIG.6B, the at least one reflection area R and the at least one lightconversion area C are distributed in a surrounding form. In FIG. 6C, theat least one reflection area R and the at least one light conversionarea C are distributed in a concentric circle form.

Referring to FIG. 6A, a light wavelength conversion module 140A has onereflection area R, two light conversion areas C1 and two lightconversion areas C2. The two light conversion areas C1 are disposed ontwo opposite sides of the reflection area R along a diagonal line of thereflection area R, and the two light conversion areas C2 are disposed ontwo opposite sides of the reflection area R along another diagonal lineof the reflection area R. Under this framework, the speckle projected tothe light wavelength conversion module 140A may be projected to thereflection area R, the light conversion area C1 and the light conversionarea C2 (along, for example, a path PT1 as shown in FIG. 6A) in turns bycontrolling at least one of the rotation angle and rotation direction ofthe reflection element via the actuator.

Referring to FIG. 6B, a light wavelength conversion module 140B may havea plurality of reflection areas R, a plurality of light conversion areasC1 and a plurality of light conversion areas C2, and the plurality ofreflection areas R, the plurality of light conversion areas C1 and theplurality of light conversion areas C2 are alternately arranged into aring. Under this framework, the speckle projected to the lightwavelength conversion module 140B may be projected to the reflectionarea R, the light conversion area C1 and the light conversion area C2(along, for example, a path PT2 as shown in FIG. 6B) in turns bycontrolling at least one of the rotation angle and rotation direction ofthe reflection element via the actuator.

Referring to FIG. 6C, a light wavelength conversion module 140C may haveone reflection area R, one light conversion area C1 and one lightconversion area C2. The reflection area R, the light conversion area C1and the light conversion area C2 are annular and share a center ofcircle. Under this framework, the light wavelength conversion module140C may rotate or may not rotate. If the light wavelength conversionmodule 140C rotates (may not rotate synchronously with the filter module170), the heat dissipation effect of the light wavelength conversionmodule 140C may be improved. In addition, the speckle projected to thelight wavelength conversion module 140C may be projected to thereflection area R, the light conversion area C1 and the light conversionarea C2 in turns by controlling at least one of the rotation angle androtation direction of the reflection element via the actuator.

Based on the foregoing, the first embodiment of the invention has atleast one of the following advantages or effects. In the illuminationsystem and the projection method of the projection apparatus of thefirst embodiment, an actuator controls at least one of the rotationangle and rotation direction of a reflection element, such that anexcitation beam transmitted from the reflection element is transmittedto different optical areas on a light wavelength conversion module indifferent time periods. Therefore, the rotation of a filter module andthe rotation of the light wavelength conversion module may not besynchronous (the light wavelength conversion module may rotate or maynot rotate). That is to say, the projection apparatus using theillumination system and the projection method of the projectionapparatus of the first embodiment may adopt a light valve onlysupporting synchronous rotation with the filter module, thereby reducingthe cost. Accordingly, the illumination system and the projection methodof the projection apparatus of the first embodiment are conducive toreduction of the cost of the projection apparatus, such that theprojection apparatus of the first embodiment may have the advantage oflow cost. In the first embodiment, a heat sink may be selectivelyprovided for assisting the light wavelength conversion module in heatdissipation, thereby improving the conversion efficiency. In addition,the light wavelength conversion module may not rotate, thereby reducingthe number of needed motors. The aforementioned projection method of theprojection apparatus refers to that a processor inside the projectionapparatus may operate relevant elements in the projection apparatus togenerate an illumination beam and an image beam according to thesettings of various elements inside the projection apparatus and thesettings of a user.

FIG. 7A to FIG. 7C are schematic diagrams of a projection apparatuswithin a first time period to a third time period in a second embodimentof the invention respectively. FIG. 8 is a flowchart of a projectionmethod of the projection apparatus in the second embodiment of theinvention.

Referring to FIG. 7A to FIG. 7C, a projection apparatus 20 of the secondembodiment is similar to the foregoing projection apparatus 10 of thefirst embodiment (referring to FIG. 1A to FIG. 1C). The main differencesbetween the two embodiments are described below.

In the illumination system 100 of the projection apparatus 10, theactuator 150 is coupled to the reflection element 130 to control atleast one of the rotation angle and rotation direction of the reflectionelement 130, such that the excitation beam B transmitted from thereflection element 130 is transmitted to different optical areas on thelight wavelength conversion module 140 in different time periods viadifferent transmission paths. In addition, the position of the lightwavelength conversion module 140 is fixed during the provision of theexcitation beam B emitted from the excitation light source 110 (inaddition, the light wavelength conversion module 140 may rotate or notrotate at the fixed position).

On the other hand, in the illumination system 200 of the projectionapparatus 20, the actuator 150 is coupled to the light wavelengthconversion module 140 to shift the light wavelength conversion module140 relative to the transmission path of the excitation beam Btransmitted from the reflection element 130, such that the reflectionarea R and the light conversion area C move to the transmission path ofthe excitation beam B transmitted from the reflection element 130 inturns. In addition, the transmission path of the excitation beam Btransmitted from the reflection element 130 is fixed during theprovision of the excitation beam B emitted from the excitation lightsource 110. That is to say, the reflection element 130 is designed to befixed without rotation during the provision of the excitation beam Bemitted from the excitation light source 110.

A projection method of the projection apparatus 20 includes steps asfollow. First, turning on the excitation light source 110 to provide theexcitation beam B (Step 810); and then, shifting the light wavelengthconversion module 140 relative to the transmission path of theexcitation beam B transmitted from the reflection element 130 by theactuator 150, such that the reflection area R and the light conversionarea C move to the transmission path of the excitation beam Btransmitted from the reflection element 130 in turns (Step 820).

In particular, referring to FIG. 7A, the filter area F1 (referring toFIG. 4) of the filter module 170 cuts into the transmission path of thelight beam transmitted from the lens element 184 within a first timeperiod. The light wavelength conversion module 140 shifts to a firstposition via the actuator 150 (for example, moves a distance D1 along adirection X1 from a third position where the light wavelength conversionmodule 140 is located in FIG. 7C), such that the reflection area R movesto the transmission path of the excitation beam B transmitted from thereflection element 130. The transmission path of the excitation beam Bwithin the first time period may be described with reference to FIG. 1A,and the descriptions thereof are omitted herein.

Referring to FIG. 7B, the filter area F2 (referring to FIG. 4) of thefilter module 170 cuts into the transmission path of the light beamtransmitted from the lens element 184 within a second time period. Thelight wavelength conversion module 140 shifts to a second positiondifferent from the first position via the actuator 150 (for example,moves a distance D2 along the direction X1 from the first position wherethe light wavelength conversion module 140 is located in FIG. 7A), suchthat the light conversion area C1 moves to the transmission path of theexcitation beam B transmitted from the reflection element 130. Thetransmission paths of the excitation beam B and the conversion beam CB1are similar to those of the excitation beam B and the conversion beamCB1 in FIG. 1B within the second time period. The two figures are mainlydifferent in that the reflection element 130 in FIG. 7B does not rotateand the light wavelength conversion module 140 in FIG. 7B shifts to thesecond position.

Referring to FIG. 7C, the filter area F3 (referring to FIG. 4) of thefilter module 170 cuts into the transmission path of the light beamtransmitted from the lens element 184 within a third time period. Thelight wavelength conversion module 140 shifts to the third positiondifferent from the second position via the actuator 150 (for example,moves a distance D3 along the direction X1 from the second positionwhere the light wavelength conversion module 140 is located in FIG. 7B),such that the light conversion area C2 moves to the transmission path ofthe excitation beam B transmitted from the reflection element 130. Thetransmission paths of the excitation beam B and the conversion beam CB2are similar to those of the excitation beam B and the conversion beamCB2 in FIG. 1C within the third time period. The two figures are mainlydifferent in that the reflection element 130 in FIG. 7C does not rotateand the light wavelength conversion module 140 in FIG. 7C shifts to thethird position.

It should be noted that the sizes of the distance D1, the distance D2and the distance D3 may be changed according to dimensions, relativedistances and relative configuration relationships of the reflectionarea R, the light conversion area C1 and the light conversion area C2,and other parameters, and are not limited to those shown in FIG. 7A toFIG. 7C.

In the second embodiment, in addition to the light wavelength conversionmodule 140 as shown in FIG. 3, the illumination system 200 may alsoadopt the light wavelength conversion module 140A as shown in FIG. 6A,the light wavelength conversion module 140B as shown in FIG. 6B or thelight wavelength conversion module 140C as shown in FIG. 6C.

When the light wavelength conversion module in FIG. 3, FIG. 6A or FIG.6B is adopted, the light wavelength conversion module may not rotateduring the provision of the excitation beam B emitted from theexcitation light source 110. That is to say, the positions of thereflection area R, the light conversion area C1 and the light conversionarea C2 are fixed during the provision of the excitation beam B emittedfrom the excitation light source 110. On the other hand, when the lightwavelength conversion module in FIG. 6C is adopted, the light wavelengthconversion module 140C may rotate or may not rotate during the provisionof the excitation beam B emitted from the excitation light source 110.If the light wavelength conversion module 140C rotates (may not rotatesynchronously with the filter module 170), the heat dissipation effectof the light wavelength conversion module 140C may be improved.

When the light wavelength conversion module (that is, the reflectionarea R, the light conversion area C1 and the light conversion area C2are distributed in a strip form or a concentric circle form) in FIG. 3or FIG. 6C is adopted, the light wavelength conversion module may shiftin a one-dimensional direction (such as the direction X1 and theopposite direction thereof) through the actuator 150, such that theexcitation beam B transmitted from the reflection element 130 istransmitted to different optical areas (such as the reflection area R,the light conversion area C1 and the light conversion area C2) on thelight wavelength conversion module in different time periods. On theother hand, when the light wavelength conversion module (that is, thereflection area R, the light conversion area C1 and the light conversionarea C2 are distributed in a surrounding form) in FIG. 6A or FIG. 6B isadopted, the light wavelength conversion module may shift in atwo-dimensional direction (such as the direction X1 and the oppositedirection thereof, and the direction X2 and the opposite directionthereof) through the actuator 150, such that the excitation beam Btransmitted from the reflection element 130 is transmitted to differentoptical areas (such as the reflection area R, the light conversion areaC1 and the light conversion area C2) on the light wavelength conversionmodule in different time periods.

Based on the foregoing, the second embodiment of the invention has atleast one of the following advantages or effects. In the illuminationsystem and the projection method of the projection apparatus in thesecond embodiment, an actuator controls a light wavelength conversionmodule to shift relative to a transmission path of an excitation beamtransmitted from a reflection element, such that a reflection area and alight conversion area move to the transmission path of the excitationbeam transmitted from the reflection element in turns. Therefore, therotation of a filter module and the rotation of the light wavelengthconversion module may not be synchronous (the light wavelengthconversion module may rotate or may not rotate). That is to say, theprojection apparatus using the illumination system and the projectionmethod of the projection apparatus of the second embodiment may adopt alight valve only supporting synchronous rotation with the filter module,thereby reducing the cost. Accordingly, the illumination system and theprojection method of the projection apparatus of the second embodimentare conducive to reduction of the cost of the projection apparatus, suchthat the projection apparatus of the second embodiment may have theadvantage of low cost. In the second embodiment, a heat sink may beselectively provided for assisting the light wavelength conversionmodule in heat dissipation, thereby improving the conversion efficiency.In addition, the light wavelength conversion module may not rotate,thereby reducing the number of needed motors.

FIG. 9A to FIG. 9C are schematic diagrams of a projection apparatuswithin a first time period to a third time period in a third embodimentof the invention respectively. FIG. 10 is a flowchart of a projectionmethod of the projection apparatus in the third embodiment of theinvention. Referring to FIG. 9A to FIG. 9C, a projection apparatus 30 ofthe third embodiment is similar to the foregoing projection apparatus 10of the first embodiment (referring to FIG. 1A to FIG. 1C). The maindifferences between the two embodiments are described below.

In the projection apparatus 30, the reflection element 130 in FIG. 1A toFIG. 1C is not provided in an illumination system 300, and a lightwavelength conversion module 340 is disposed on a transmission path ofan excitation beam B transmitted from a light combination element 320.

The light wavelength conversion module 340 has a plurality of opticalareas. The plurality of optical areas include at least one penetrationarea T and at least one light conversion area C. The penetration area Tis adapted to allow the excitation beam B to pass through, and the lightconversion area C (such as a light conversion area C1 and a lightconversion area C2) is adapted to convert the excitation beam B into aconversion beam (such as a conversion beam CB1 and a conversion beamCB2) and reflect the conversion beam. For example, a light wavelengthconversion material and a reflection layer (or a reflection element) maybe provided in the light conversion area C. In addition, lightscattering particles may also be selectively provided in the lightconversion area C to improve the conversion efficiency.

In the embodiment, the plurality of optical areas include a penetrationarea T and two light conversion areas C (such as the light conversionarea C1 and the light conversion area C2). In addition, the penetrationarea T, the light conversion area C1 and the light conversion area C2are distributed in a concentric circle form as shown in FIG. 6C.However, the respective number of penetration areas T and lightconversion areas C in the light wavelength conversion module 340 and thearrangement manner of the penetration areas T and the light conversionareas C are not limited to those shown in FIG. 9A to FIG. 9C.

The illumination system 300 further includes a plurality of light guideelements G. The plurality of light guide elements G are disposed on thetransmission path of the excitation beam B passing through thepenetration area T, so as to transfer the excitation beam B passingthrough the penetration area T back to the light combination element320. For example, the plurality of light guide elements G may be, butare not limited to, reflection mirrors, respectively.

The light combination element 320 is also disposed on, in addition tothe transmission path of the excitation beam B emitted from theexcitation light source 110, the transmission path of the conversionbeam (such as the conversion beam CB1 and the conversion beam CB2)reflected by the light conversion area C and the transmission path ofthe excitation beam B transmitted from the plurality of light guideelements G. In the embodiment, the light combination element 320 isdesigned to reflect the excitation beam B and allow the conversion beamCB1 and the conversion beam CB2 to pass through. The light combinationelement 320 is, for example, a dichroic mirror, adapted to reflect theexcitation beam B and allow the conversion beam CB1 and the conversionbeam CB2 to pass through.

The actuator 150 is coupled to the light combination element 320 tochange at least one of a rotation angle and rotation direction of thelight combination element 320, thereby transferring the excitation beamB transmitted from the light combination element 320 to the plurality ofoptical areas (such as the penetration area T, the light conversion areaC1 and the light conversion area C2) of the light wavelength conversionmodule 340 via different transmission paths.

A projection method of the projection apparatus 30 includes steps asfollow. First, turning on the excitation light source 110 to provide theexcitation beam B (Step 1010); and then, changing at least one of therotation angle and rotation direction of the light combination element320 by the actuator 150, such that the excitation beam B transmittedfrom the light combination element 320 is transmitted to the pluralityof optical areas of the light wavelength conversion module 340 viadifferent transmission paths (Step 1020).

In particular, referring to FIG. 9A, the filter area F1 (referring toFIG. 4) of the filter module 170 cuts into the transmission path of thelight beam transmitted from the lens element 184 within a first timeperiod. By means of the actuator 150, the light combination element 320has the first rotation angle θ4 (for example, rotates counterclockwiseby the first rotation angle θ4 from the inclination plane P6 where thelight combination element 320 is located in FIG. 9C to the inclinationplane P4), such that the excitation beam B emitted from the excitationlight source 110 is transmitted back to the light combination element320 having the first rotation angle θ4 sequentially via the lens element181, the light combination element 320 having the first rotation angleθ4, the lens element 182, the lens element 183, the penetration area Tof the light wavelength conversion module 340, and the plurality oflight guide elements G. The excitation beam B is then reflected by thelight combination element 320 having the first rotation angle θ4 andtransmitted to the filter module 170 through the lens element 184. Thefilter area F1 of the filter module 170 allows at least a portion of theexcitation beam B to pass through.

Referring to FIG. 9B, the filter area F2 of the filter module 170 cutsinto the transmission path of the light beam transmitted from the lenselement 184 within a second time period. By means of the actuator 150,the light combination element 320 has a second rotation angle θ5 (forexample, rotates counterclockwise by the second rotation angle θ5 fromthe inclination plane P4 where the light combination element 320 islocated in FIG. 9A to the inclination plane P5), such that theexcitation beam B emitted from the excitation light source 110 istransmitted to the light conversion area C1 of the light wavelengthconversion module 340 sequentially via the lens element 181, the lightcombination element 320 having the second rotation angle θ5, the lenselement 182, and the lens element 183. The light conversion area C1converts the excitation beam B into the conversion beam CB1 and reflectsthe conversion beam CB1. The conversion beam CB1 reflected by the lightconversion area C1 is transmitted to the light combination element 320having the second rotation angle θ5 sequentially via the lens element183 and the lens element 182. The conversion beam CB1 transmitted to thelight combination element 320 having the second rotation angle θ5 isthen transmitted to the filter module 170 after sequentially passingthrough the light combination element 320 and the lens element 184. Thefilter area F2 of the filter module 170 allows the first color beam B1(such as the red beam) in the conversion beam CB1 (such as the yellowbeam) to pass through, and filters out/absorbs the green beam in theconversion beam CB1.

Referring to FIG. 9C, the filter area F3 of the filter module 170 cutsinto the transmission path of the light beam transmitted from the lenselement 184 within a third time period. By means of the actuator 150,the light combination element 320 has a third rotation angle θ6 (forexample, rotates clockwise by the third rotation angle θ6 from theinclination plane P5 where the light combination element 320 is locatedin FIG. 9B to the inclination plane P6), such that the excitation beam Bemitted from the excitation light source 110 is transmitted to the lightconversion area C2 of the light wavelength conversion module 340sequentially via the lens element 181, the light combination element 320having the third rotation angle θ6, the lens element 182, and the lenselement 183. The light conversion area C2 converts the excitation beam Binto the conversion beam CB2 and reflects the conversion beam CB2. Theconversion beam CB2 reflected by the light conversion area C2 istransmitted to the light combination element 320 having the thirdrotation angle θ6 sequentially via the lens element 183 and the lenselement 182. The conversion beam CB2 transmitted to the lightcombination element 320 having the third rotation angle θ6 is thentransmitted to the filter module 170 after sequentially passing throughthe light combination element 320 and the lens element 184. The filterarea F3 of the filter module 170 allows at least a portion of theconversion beam CB2 to pass through.

It should be noted that the sizes of the first rotation angle θ1, thesecond rotation angle θ2 and the third rotation angle θ3 may be changedaccording to dimensions, relative distances and relative configurationrelationships of the penetration area T, the light conversion area C1and the light conversion area C2, and other parameters, and are notlimited to those shown in FIG. 9A to FIG. 9C.

In the third embodiment, the penetration area T, the light conversionarea C1 and the light conversion area C2 of the light wavelengthconversion module 340 may be distributed in a concentric circle form asshown in FIG. 6C (the reflection area R in FIG. 6C is replaced with thepenetration area T, and the reflection layer 142 is not disposed in thepenetration area T). Under this framework, the light wavelengthconversion module 340 may rotate or may not rotate during the provisionof the excitation beam B emitted from the excitation light source 110.If the light wavelength conversion module 340 rotates (may not rotatesynchronously with the filter module 170), the heat dissipation effectof the light wavelength conversion module 340 may be improved.

In the third embodiment, the penetration area T, the light conversionarea C1 and the light conversion area C2 of the light wavelengthconversion module 340 may also be distributed in a strip form as shownin FIG. 3, in a surrounding form as shown in FIG. 6A, or in asurrounding form as shown in FIG. 6B (but the reflection area R in FIG.3, FIG. 6A and FIG. 6B is replaced with the penetration area T, and thereflection layer 142 is not disposed in the penetration area T). Whenthe penetration area T, the light conversion area C1 and the lightconversion area C2 are arranged in a manner in FIG. 3, FIG. 6A or FIG.6B, the light wavelength conversion module may not rotate during theprovision of the excitation beam B emitted from the excitation lightsource 110. That is to say, the positions of the plurality of opticalareas (such as the reflection area R, the light conversion area C1 andthe light conversion area C2) may be fixed during the provision of theexcitation beam B emitted from the excitation light source 110.

Based on the foregoing, the third embodiment of the invention has atleast one of the following advantages or effects. In the illuminationsystem and the projection method of the projection apparatus of thethird embodiment, an actuator controls at least one of the rotationangle and rotation direction of a light combination element, such thatan excitation beam transmitted from the light combination element istransmitted to different optical areas on a light wavelength conversionmodule in different time periods. Therefore, the rotation of a filtermodule and the rotation of the light wavelength conversion module may benot synchronous (the light wavelength conversion module may rotate ormay not rotate). That is to say, the projection apparatus using theillumination system and the projection method of the projectionapparatus of the third embodiment may adopt a light valve onlysupporting synchronous rotation with the filter module, thereby reducingthe cost. Accordingly, the illumination system and the projection methodof the projection apparatus of the third embodiment are conducive toreduction of the cost of the projection apparatus, such that theprojection apparatus of the third embodiment may have the advantage oflow cost. In the third embodiment, the light wavelength conversionmodule may not rotate, thereby reducing the quantity of needed motors.

The foregoing description of the preferred embodiments of the inventionhas been presented for purposes of illustration and description. It isnot intended to be exhaustive or to limit the invention to the preciseform or to exemplary embodiments disclosed. Accordingly, the foregoingdescription should be regarded as illustrative rather than restrictive.Obviously, many modifications and variations will be apparent topractitioners skilled in this art. The embodiments are chosen anddescribed in order to best explain the principles of the invention andits best mode practical application, thereby to enable persons skilledin the art to understand the invention for various embodiments and withvarious modifications as are suited to the particular use orimplementation contemplated. It is intended that the scope of theinvention be defined by the claims appended hereto and their equivalentsin which all terms are meant in their broadest reasonable sense unlessotherwise indicated. Therefore, the term “the invention”, “theinvention” or the like does not necessarily limit the claim scope to aspecific embodiment, and the reference to particularly preferredexemplary embodiments of the invention does not imply a limitation onthe invention, and no such limitation is to be inferred. The inventionis limited only by the spirit and scope of the appended claims.Moreover, these claims may refer to use “first”, “second”, etc.following with noun or element. Such terms should be understood as anomenclature and should not be construed as giving the limitation on thenumber of the elements modified by such nomenclature unless specificnumber has been given. The abstract of the disclosure is provided tocomply with the rules requiring an abstract, which will allow a searcherto quickly ascertain the subject matter of the technical disclosure ofany patent issued from this disclosure. It is submitted with theunderstanding that it will not be used to interpret or limit the scopeor meaning of the claims. Any advantages and benefits described may notapply to all embodiments of the invention. It should be appreciated thatvariations may be made in the embodiments described by persons skilledin the art without departing from the scope of the invention as definedby the following claims. Moreover, no element and component in thepresent disclosure is intended to be dedicated to the public regardlessof whether the element or component is explicitly recited in thefollowing claims.

What is claimed is:
 1. A projection apparatus, comprising: anillumination system, comprising: an excitation light source, adapted toprovide an excitation beam; a light combination element, disposed on atransmission path of the excitation beam emitted from the excitationlight source; a reflection element, disposed on a transmission path ofthe excitation beam transmitted from the light combination element; alight wavelength conversion module, disposed on a transmission path ofthe excitation beam transmitted from the reflection element, wherein thelight wavelength conversion module comprises at least one reflectionarea and at least one light conversion area, the at least one reflectionarea reflects the excitation beam, the at least one light conversionarea converts the excitation beam into a conversion beam and reflectsthe conversion beam, and the excitation beam reflected by the at leastone reflection area and the conversion beam reflected by the at leastone light conversion area are reflected by the reflection element andthus transmitted back to the light combination element; and an actuator,coupled to the reflection element, adapted to change a rotation angle ofthe reflection element, such that the excitation beam transmitted fromthe reflection element is transmitted to the at least one reflectionarea and the at least one light conversion area via differenttransmission paths; a light valve, disposed on a transmission path of anillumination beam output from the illumination system, wherein the lightvalve converts the illumination beam into an image beam; and aprojection lens, disposed on a transmission path of the image beam. 2.The projection apparatus of claim 1, wherein the light combinationelement comprises a dichroic portion and a penetration portion, thedichroic portion reflects the excitation beam and allows the conversionbeam to pass through, the penetration portion allows the excitation beamand the conversion beam to pass through, the dichroic portion isdisposed on the transmission path of the excitation beam emitted fromthe excitation light source and a transmission path of the conversionbeam sequentially reflected by the at least one light conversion areaand the reflection element, and the penetration portion is disposed onthe transmission path of the conversion beam sequentially reflected bythe at least one light conversion area and the reflection element and atransmission path of the excitation beam sequentially reflected by theat least one reflection area and the reflection element.
 3. Theprojection apparatus of claim 2, wherein the illumination system furthercomprises: a partially transmissive partially reflective element,disposed on a transmission path of the excitation beam passing throughthe penetration portion, wherein the partially transmissive partiallyreflective element allows a first part of the excitation beam passedthrough the penetration portion to pass through, the partiallytransmissive partially reflective element reflects a second part of theexcitation beam passed through the penetration portion, and the dichroicportion is disposed on a transmission path of the second part reflectedby the partially transmissive partially reflective element.
 4. Theprojection apparatus of claim 1, wherein the light wavelength conversionmodule comprises a heat sink, and the at least one reflection area andthe at least one light conversion area are disposed on the heat sink. 5.The projection apparatus of claim 1, wherein the at least one reflectionarea and the at least one light conversion area are distributed in astrip form, a surrounding form or a concentric circle form.
 6. Theprojection apparatus of claim 1, wherein positions of the at least onereflection area and the at least one light conversion area are fixedduring provision of the excitation beam emitted from the excitationlight source.
 7. The projection apparatus of claim 1, wherein within afirst time period, the reflection element comprises a first rotationangle, the excitation beam emitted from the excitation light source istransmitted back to the reflection element comprising the first rotationangle sequentially via the light combination element, the reflectionelement comprising the first rotation angle and the at least onereflection area, and the excitation beam is reflected by the reflectionelement comprising the first rotation angle again and thus transmittedto the light combination element; and within a second time period, thereflection element comprises a second rotation angle, the excitationbeam emitted from the excitation light source is transmitted to the atleast one light conversion area sequentially via the light combinationelement and the reflection element comprising the second rotation angle,and the conversion beam reflected by the at least one light conversionarea is reflected by the reflection element comprising the secondrotation angle again and thus transmitted to the light combinationelement.
 8. The projection apparatus of claim 1, wherein theillumination system further comprises: a filter module, wherein theexcitation beam reflected by the at least one reflection area and theconversion beam reflected by the at least one light conversion area aretransmitted toward the filter module sequentially via the reflectionelement and the light combination element, and a rotation of the filtermodule and a rotation of the light wavelength conversion module are notsynchronous.
 9. An illumination system, comprising: an excitation lightsource, adapted to provide an excitation beam; a light combinationelement, disposed on a transmission path of the excitation beam emittedfrom the excitation light source; a reflection element, disposed on atransmission path of the excitation beam transmitted from the lightcombination element; a light wavelength conversion module, disposed on atransmission path of the excitation beam transmitted from the reflectionelement, wherein the light wavelength conversion module comprises atleast one reflection area and at least one light conversion area, the atleast one reflection area reflects the excitation beam, the at least onelight conversion area converts the excitation beam into a conversionbeam and reflects the conversion beam, and the excitation beam reflectedby the at least one reflection area and the conversion beam reflected bythe at least one light conversion area are reflected by the reflectionelement and thus transmitted back to the light combination element; andan actuator, coupled to the reflection element, adapted to change arotation angle of the reflection element, such that the excitation beamtransmitted from the reflection element is transmitted to the at leastone reflection area and the at least one light conversion area viadifferent transmission paths.
 10. The illumination system of claim 9,wherein the light combination element comprises a dichroic portion and apenetration portion, the dichroic portion reflects the excitation beamand allows the conversion beam to pass through, the penetration portionallows the excitation beam and the conversion beam to pass through, thedichroic portion is disposed on the transmission path of the excitationbeam emitted from the excitation light source and a transmission path ofthe conversion beam sequentially reflected by the at least one lightconversion area and the reflection element, and the penetration portionis disposed on the transmission path of the conversion beam sequentiallyreflected by the at least one light conversion area and the reflectionelement and a transmission path of the excitation beam sequentiallyreflected by the at least one reflection area and the reflectionelement.
 11. The illumination system of claim 10, further comprising: apartially transmissive partially reflective element, disposed on atransmission path of the excitation beam passing through the penetrationportion, wherein the partially transmissive partially reflective elementallows a first part of the excitation beam passed through thepenetration portion to pass through, the partially transmissivepartially reflective element reflects a second part of the excitationbeam passed through the penetration portion, and the dichroic portion isalso disposed on a transmission path of the second part reflected by thepartially transmissive partially reflective element.
 12. Theillumination system of claim 9, wherein the light wavelength conversionmodule comprises a light wavelength conversion layer and a heat sink,and the light wavelength conversion layer is disposed on the heat sink.13. The illumination system of claim 9, wherein the at least onereflection area and the at least one light conversion area aredistributed in a strip form, a surrounding form or a concentric circleform.
 14. The illumination system of claim 9, wherein positions of theat least one reflection area and the at least one light conversion areaare fixed during provision of the excitation beam emitted from theexcitation light source.
 15. The illumination system of claim 9, whereinwithin a first time period, the reflection element comprises a firstrotation angle, the excitation beam emitted from the excitation lightsource is transmitted back to the reflection element comprising thefirst rotation angle sequentially via the light combination element, thereflection element comprising the first rotation angle and the at leastone reflection area, and the excitation beam is reflected by thereflection element comprising the first rotation angle again and thustransmitted to the light combination element; and within a second timeperiod, the reflection element comprises a second rotation angle, theexcitation beam emitted from the excitation light source is transmittedto the at least one light conversion area sequentially via the lightcombination element and the reflection element comprising the secondrotation angle, and the conversion beam reflected by the at least onelight conversion area is reflected by the reflection element comprisingthe second rotation angle again and thus transmitted to the lightcombination element.
 16. The illumination system of claim 9, furthercomprising: a filter module, wherein the excitation beam reflected bythe at least one reflection area and the conversion beam reflected bythe at least one light conversion area are transmitted toward the filtermodule sequentially via the reflection element and the light combinationelement, and rotation of the filter module and rotation of the lightwavelength conversion module are not synchronous.
 17. A projectionmethod of a projection apparatus, applied to an illumination system ofthe projection apparatus, the illumination system comprising: anexcitation light source, a light combination element, a reflectionelement, a light wavelength conversion module and an actuator, whereinthe light wavelength conversion module comprises at least one reflectionarea and at least one light conversion area, the projection methodcomprising: turning on the excitation light source to provide anexcitation beam; and changing a rotation angle of the reflection elementby the actuator, such that the excitation beam transmitted from thereflection element is transmitted to the at least one reflection areaand the at least one light conversion area of the light wavelengthconversion module via different transmission paths.
 18. The projectionmethod of the projection apparatus of claim 17, wherein positions of theat least one reflection area and the at least one light conversion areaare fixed during provision of the excitation beam emitted from theexcitation light source.
 19. The projection method of the projectionapparatus of claim 17, wherein within a first time period, rotating thereflection element to a first rotation angle by the actuator, such thatthe excitation beam emitted from the excitation light source istransmitted back to the reflection element comprising the first rotationangle sequentially via the light combination element, the reflectionelement comprising the first rotation angle and the at least onereflection area, and the excitation beam is reflected by the reflectionelement comprising the first rotation angle again and thus transmittedto the light combination element; and within a second time period,rotating the reflection element to a second rotation angle by theactuator, such that the excitation beam emitted from the excitationlight source is transmitted to the at least one light conversion areasequentially via the light combination element and the reflectionelement comprising the second rotation angle, and a conversion beamreflected by the at least one light conversion area is reflected by thereflection element comprising the second rotation angle again and thustransmitted to the light combination element.
 20. The projection methodof the projection apparatus of claim 17, further comprising: dissipatingheat transmitted from the light wavelength conversion module by a heatsink.
 21. The projection method of the projection apparatus of claim 17,further comprising: rotating a filter module, such that a plurality offilter areas of the filter module cut into transmission paths of theexcitation beam reflected by the at least one reflection area and theconversion beam reflected by the at least one light conversion area inturns, wherein rotation of the filter module and rotation of the lightwavelength conversion module are not synchronous.